American Ninja Warrior 4

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"American Ninja Warrior" returns for its fourth season of wacky obstacles with former Olympian Jonny Moseley joining the show as co-host alongside Matt Iseman. For this season, six regional qualifiers were held across the U.S. to find 100 people to be given the chance to compete at the national finals in Las Vegas for a shot at a $500,000 cash prize and the title of American Ninja Warrior. Among the everyday men and women in the competition are firefighters, teachers, police officers and social workers.